IsConnectionRefused returns true if the given error is caused by an "connection refused" error.

IsConnectionReset returns true if the given error is caused by an "connection reset by peer" error.

IsContextCanceled returns true if the given error is caused by a context cancelation.

IsContextCanceledOrExpired returns true if the given error is caused by a context cancelation or deadline expiration.

IsContextDeadlineExpired returns true if the given error is caused by a context deadline expiration.

IsEOF returns true if the given error is caused by an EOF error.

IsTemporary returns true if the given error is caused by a temporary error.

IsTimeout returns true if the given error is caused by a timeout error.

WithMessage annotates err with a new message.